Ask ten people “how much house can you afford?” and you’ll likely get ten different answers — because most people are answering the wrong question. The number a lender approves you for and the number that actually fits your life comfortably are often two very different figures. Understanding that gap is where real mortgage planning begins.
Here’s how to figure out how much house you can afford — not just how much you could technically qualify for.
What “Afford” Really Means in a Mortgage Plan
When most people ask how much house they can afford, they’re really asking what a lender will approve them for. That’s an important number, but it’s only half the picture. A lender’s approval reflects what your income and debt can support under specific guidelines — it doesn’t know your savings goals, your travel plans, your career changes, or how you feel about a payment that stretches your monthly budget thin.
The planning-first version of this question looks different: how much house can you afford and still comfortably live the life you want — saving for retirement, handling an emergency, and not feeling house-poor the month after closing?
The Numbers Lenders Use to Calculate Affordability
Lenders lean on a few core figures to determine how much house you can afford from their perspective:
- Gross monthly income — your income before taxes, the starting point for every calculation.
- Debt-to-income ratio (DTI) — your total monthly debt payments, including your new mortgage, divided by your gross monthly income. Most loan programs want this at 43% or below, though some allow more with strong compensating factors.
- Credit score — affects not just approval, but your interest rate, which directly changes what payment your income can support.
- Down payment — a larger down payment reduces your loan amount and your monthly payment, which changes how much house fits your income.
The 28/36 Rule — A Useful Starting Point
A common guideline for how much house you can afford is the 28/36 rule: your housing payment shouldn’t exceed 28% of your gross monthly income, and your total debt payments (including housing) shouldn’t exceed 36%. It’s not a hard rule — plenty of approved loans fall outside it — but it’s a helpful, quick gut-check before you start looking at listings seriously.
Why “Approved” and “Comfortable” Are Different Numbers
This is the piece that gets lost in most affordability conversations. A lender might approve you for a payment near the top of what your DTI allows. That doesn’t mean it’s the payment you should choose.
Consider two buyers with identical approvals. One has significant student loan debt easing off in two years and strong savings habits. The other is stretching to the top of their approval with little cushion left over. Both were “approved” for the same amount — but how much house they can actually afford, comfortably, is not the same at all.
This is exactly why a real affordability conversation happens before you fall in love with a listing, not after.
How Your Down Payment Changes How Much House You Can Afford
Your down payment does more than reduce what you borrow — it can also eliminate costs like private mortgage insurance (PMI) on a conventional loan, which frees up monthly budget room. A 20% down payment avoids PMI entirely on most conventional loans, while smaller down payments — 3%, 5%, or 10% — remain common and simply factor PMI into the monthly payment math.
There’s no single “right” down payment. The right one is whatever keeps your monthly payment inside your comfortable range while leaving your savings and reserves intact.
Don’t Forget the Costs Beyond Principal and Interest
How much house you can afford isn’t just about the loan itself. Property taxes (which vary meaningfully across North Texas counties and cities), homeowners insurance, HOA dues where applicable, and PMI when it applies all factor into your true monthly payment — often called PITI (Principal, Interest, Taxes, Insurance). Two homes with the same purchase price can have very different true monthly costs depending on where they sit and what they carry.
How to Actually Calculate How Much House You Can Afford
The fastest way to get a real number is to run your income, debt, and down payment through a proper affordability calculator — and then have that number reviewed by a mortgage planner who can flag anything a calculator can’t see, like upcoming life changes or income that needs special documentation.
Start with our Home Affordability Calculator to get a working number, then bring it into a real conversation to see how it holds up against your full financial picture.
Mortgage Planner’s Perspective
At Texas Mortgage Plan, we’ve found that affordability isn’t just about what a lender approves. The right home purchase should fit comfortably within your overall financial goals, leaving room to save, invest, and enjoy life after closing. A mortgage should support your future, not limit it.
Ready to See What Fits Your Financial Goals?
Whether you’re just beginning to explore homeownership or you’re ready to get pre-approved, we’re here to help you build a mortgage plan that fits your life.
Schedule a Mortgage Planning Consultation or Start Your Pre-Approval today.
Continued Reading
What Does Mortgage Pre-Approval Really Mean? →
Down Payment Strategies (future post)
Debt-to-Income Ratio (future post, Credit & Qualification subcategory)
Frequently Asked Questions
Q: How much house can I afford based on my salary?
A: A common starting guideline is that your monthly housing payment shouldn’t exceed 28% of your gross monthly income, and your total monthly debts shouldn’t exceed 36%. This varies based on credit score, down payment, and the specific loan program, which is why a personalized calculation is more accurate than a flat percentage of salary.
Q: Is the amount I’m approved for the same as what I can afford?
A: Not necessarily. Lender approval reflects what your income and debt can support under underwriting guidelines. What you can comfortably afford also depends on your savings goals, other financial priorities, and how much monthly cushion you want — factors a lender’s approval doesn’t account for.
Q: How does my down payment affect how much house I can afford?
A: A larger down payment lowers your loan amount and monthly payment, and a down payment of 20% or more typically eliminates private mortgage insurance (PMI) on a conventional loan, freeing up additional monthly budget room.
Q: What costs besides the mortgage payment should I factor into affordability?
A: Property taxes, homeowners insurance, HOA dues where applicable, and PMI when it applies all affect your true monthly housing cost — often referred to as PITI (Principal, Interest, Taxes, Insurance). These can vary significantly by city and county across North Texas.
Q: What’s the best way to find out how much house I can actually afford?
A: Start with an affordability calculator to get a working estimate, then review that number with a mortgage planner who can factor in your full financial picture — income type, upcoming life changes, and long-term goals — rather than relying on a lender’s maximum approval alone.
Texas Mortgage Plan – 50+ years of combined mortgage experience, serving homeowners and homebuyers across Flower Mound and the DFW Metroplex.
Elizabeth Rose, NMLS 252686, CDLP® Certified Divorce Lending Professional | Shea Patton, Mortgage Advisor, NMLS #251397, Licensed Realtor
a d/b/a of Legacy Mortgage, NMLS #1759275 | Equal Housing Lender
